Planourapi co



T. SCHRO'DER-NIELSEN.

BOAT DAVIT. APPLICATION FILED MAR. 21. 1918.

1,3 12,272.. Patented Augnfi, 1919.

'IHE COLUMBIA PLANOGRAPII cm, WASHINGTON. D. C-

APPLICATION FILED MAR. 27' I918.

T. SCHRUDER-NIELSEN.

BOAT DAVIT.

Patented Aug. 5, 1919.

4 SHEETS-SHEET 2.

\IIC coumnm PLANnu'lLUH cu. WASIHNGTON. I). c.

T. SCHRUDER-NIELSEN.

BOAT DAVIT.

APPLICATION FILED MAR. 27. I918.

Patented Aug. 5, 1919.

4 SHEETS-SHEET 3.

112 Mihmmi z' THE coLuMmA PLANOURAPI 60.. WASHINGTON, 0 c.

T. SCHR O DER-NlELSEN.

BOAT DAVIT.

APPLlCATlON FILED MAR, 27. 1918.

1,812,272. Patented Aug. 5,1919.

4 SHEETS-SHEET 4.

I THE COLUMIHA vumnmmvn 20., WAhu-nulON, n. c

vnirnn STATES PATENT OFFICE.

THORALF scnnonnnpmntsnn, or HOB-TEN, NORWAY, Assienon o cnnrsrorrnn HANNEVIG AND HANNEVIG BROTHERS, A/S., or CHRISTIANIA, NORWAY.

BOAT-DAVIE.

rename.

To all whom it may concern:

Be it known that I, THORALF SoHRoDnR- NIELSEN, a subject of the King ofNorway, residing at Horten, in the Kingdom of Norway, have invented certain new and useful Improvements in Boat-Davits; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and toletters or figures of reference marked thereon, which form a part of this specification. l

The present invention relates to boat davits of the kind, which are mounted to swing on an inclined axis in order that the boat may beeasily swung out, even when the ship has a heavy list or is rolling on high sea.

According to the present invention the angle of the davit axis and the form of the davit are so adjusted that the boat rib is brought to the level of the ships deck, when the boat is swung out, whereby the boat may conveniently be manned without lowering the same and without being hindered by the rolling of the ship or by the ship having a list. Further the davit is so formed that the distance from the fastening point of the boat to the nearest part Of the ship, when the boat is swung out, is longer than from the fastening point of the boat to the lowest point of the same.

By this arrangement the boat when being lowered can not strike the ships side and be molested thereby, even when the ship is rolling very much or has ahe-avylist.

On the drawings Figure 1 is an end new of the davit and itsoperating'girder. Fig. 2 is a side view of the same. Fig. 3 is a diagrammatical View of the boat and davits in different positions as seen from above. Fig. 4: is a diagrammatica l view of the girder in position for steadying the boat when the same is swung out.

The davit 1 is supported in sockets 2-3 in such a manner, that the axisof the davit forms an angle of about degrees with the deck. At the top of socket 2 the davit is provided With a ring l, having a stopper which serves to revent the movement of the davit in one direction.

The two davits l are connected at their upper ends by means of a bar or rod 5,

Specification of Letters Patent.

Patented Aug. 5, 1919.

Application filed March 27, 1918. Serial No. 224,992.

which is mounted on trnnnions67 atthe end of each davit'and secured in position by means of a pin] or other suitable device. Said bar 5 which may suitably consist of an I-beam, serves to steady the davits and to support tlieblocks 89 by which the boat is lowered and raised. Also by means of this connecting bar the movement of both davits are made synchronous. In order to keep the davit in its inner or outer position and to perform the swinging movement of the davit, aforked cable 14: is provided, which is fastened with its two endstothe bar 5,

one part of the cable fork being fastened to one end of bar 5, while the other end of the fork is fastened to bar 5 at a ately in front of 'block 8.

At the middle the forked cablell is conpoint innnedi nected to' tackles 10 --11,the standing blocks of which are fastened to a support 28 near the middle on the ships deck. Said support 1 28 may also serve as support for the cable belonging to the boat at the opposite side of the ship. The distance between the stand- 111g blocks at the support may conveniently be made a little larger than the radius of the davit.

The support is so placed that the tackle 11 is perpendicular to the bar 5, when the latter is in itsmiddle position (indicated on Fig. 3 i in pointand dotted line). When the davit is swung into its inner position as indicated in full lines on Fig. 3 one member of the cables 14: should be in line with tackle 10a l The tackle l l duringthe swinging out of the davit should take the stress from the tacklelO some time beforethe davit bar 5.

passes its middle position, when the fall of the tacklell is not slackened. Whenthe boat is hauled in or when the ship is rolling heavily (c. 9., more than 30 degrees) the davit is kept in its outer position by engagswung in an outwardly and downwardly direction by means of the weight of the boat. Wires 2 6"27 prevent the checks from swinging to'omuch inthe opposite direction.

The davit is operated in the following manner: H v p A sib'iagmg at: tiiedavit'. The tackle is slackened until the stress is talifil 11p by the tackle 11. The tackle 11 out. r position by means of hooks 29 in the manner described, I

Swinging in the davit.

' tackle-1 1 is hauled until an '5 has pa s d; 's-middl t s-fie wher up n the a -ins p o ee s by mea s Pt t e e el (l Yhen the deem reached its inner positirin -both tackles are hauled taut and fas- I claim: p" j k V -.b0at. t moun ed to r in 1- inedl 'e ke a th ngl f t e s c e and e-fa m. Qfthe dav b ing SQ, p p o hatsthedistah ea r ni t e de tii t copies of fliils patent iiiay be'ottained for nearest part. of the ship, when the davit is swung ,out, is longer than from the davit jib ,to,the keelof the life boa 2,. ,Aiboatdavit mounted to turn in inclined sockets, theiangleof the socket and the form of the davit being so proportioned that} the boat rib is lowered approximately to .zthe levelqof theiships deck, when the davitsare' swung out, the davit jib's being connectedbynmeans ofa .rod or bar, the ends. of whichare mounted on trunn'i'ons at thetopof each jl'b r 3. A boat davit inountedto turn in in: clined sockets, the angle of the socket and the form of the davit being'so proportioned thatsthe boat rib is lowered approximately to thel'evel of the shi'ps deck, when the davits are swung out, the davit jibs being connected by means of a rod or bar, the ends ofwhich are mountedon'trnnnions at the top of each jib, a forked girder being connected with its ends to two points of said bar'an'd at the middle to two tackles fastened some distance apart to a stationary part of the ship.

4. A boat davit mounted to turn in inclined sockets, the angle of the socket and the form of the davit being so proportioned, that. the boat rib is lowered approximately to the level of the ships deck, when the davits are swung out, the davit jibs being connectedby means of a rod or bar, the ends of which are mounted on trunnions at the top of each jib, a forked girder being connected with its ends to two points of said bar and at the middle to two tackles, the standing blocks of which are fastened to a stationary part of the ship at points some 1distance apart on a line parallel to the said ar. y

5. A boat davit mounted to turn in inclined sockets, the angle of the socket and the formof the davit being so proportioned that the boat rib is lowered approximately to the level of the ships deck, when the davits are swung out, the davit jibs being connected by means of a rod or bar, the ends of which are mounted on trunnions atthe top' of each jib, a forked girder being connected with its ends to two points of said bar and at the middle to two tackles, the standing blocks of which are fastened to a stationary part of the ship in such a manner, that one tackle is perpendicular on said bar, when the boat is in its middle position, while the other tackle is in line with one part of the forked girder, when the davits are in their inner position.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

THORALF SCHRllDElt-NIELSEN.

Witnesses:

C. FABRICIUS HANSEN, M. W. KAHN.

five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

